It really won't be worth your time mate, flashed 360's are a complete pain in the ass, and I've had my slim replaced twice now by Microsoft because of the disc drive playing up and it being incredibly loud - not only that but with the new dash on the way flashed slims are going to be useless for XBL for at least a month or two..just a heads up. My honest suggestion is buy a Jtag and a retail unit - use the jtag to play copied games ect and the retail for when you want to go online.
Yes, I am a noob, but I am not stupid.
System progress: 60GB 3.55 KMEAW installed, YLOD fixed, working replacement BluRay Drive..will have ribbon tomorrow, so hopefully my system will be up and running!
Big up to Pereb27